Year	% of population
1993	55.5
1994	56.6
1995	57
1996	56.2
1997	55.7
1998	55
1999	54.7
2001	51.6
2002	50.9
2003	50
2004	48.1
2005	47.2
2006	46.4
2007	45.4
2008	44.5
2009	44.3
2010	43.1
2011	42.5
2012	42
2013	41.5
2014	41.2
2015	42.2
2016	42.5
2017	42.5
2018	42.4